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FALLS CHURCH, Va. (AP) — Amazon has revealed plans for the next phase of its headquarters redevelopment in Virginia, featuring a signature 350-foot helix-shaped office tower that can be climbed from the outside like a mountain hike.

The head-turning helix building is the centerpiece of the proposal that also features three 22-story office buildings.

The Seattle-based company is looking to accommodate 25,000 new workers over the coming years in the Arlington County neighborhoods across the Potomac River from the nation’s capital.

The company said in a blog post that the building is designed to help people connect to nature.

Sketches show trees spiraling along the building’s exterior. Amazon said the exterior climb will be open to public tours on weekends.